One of the questions surrounding the Nationals this offseason is what they have planned for Victor Robles, their 20-year-old top prospect, in 2018. The center fielder was the youngest player to appear in a major league game last season, but wasn’t overwhelmed in his limited action. He was electrifying. Robles tops the next wave of talent in the Nationals’ farm system, but he already looked like he belonged. But the Nationals don’t plan on having Robles begin the 2018 season on their major league roster, according to a person with knowledge of the situation.